public class java2024_5_17 {
    //    public static void main(String[] args) {
////        Student student = new Student("zhangsan", 18);
////        System.out.println(student);
////        Student student = new Student();
////        student.show();
//    }
//    public static void main(String[] args) {
//        //四个权限修饰符 - private + default + protected + public
//
//        //final
//        //(1)修饰常量
////        int a = 100;
////        System.out.println(a);
////        a = 0;
////        System.out.println(a);
//        //(2)修饰方法 - 该方法不能重写
//        //（3）修饰类 - 该类不能被继承
//    }
    public static void main(String[] args) {
        //向上转型
//        People people = new Student("zhangsan", 18, "113");
//        people.Stushow();
    }
}
